Not faux outrage. Misplaced outrage. The problem is real, but "The Great Wall" is not a good example of Hollywood white-washing. However, the marketing of the movie in the US actually WAS a good example of white-washing.
Haven't seen the film yet, but from what I've been told, Matt Damon isn't the "hero" or main protagonist of the film. However, you'd have to be forgiven if you got that impression from the US marketing.
I'm not happy with the casting decisions of "Doctor Strange", although I think Tilda Swinton will do an amazing job as The Ancient One. But white-washing her character for CHINESE audiences (instead of US audiences) is a sad ploy to have the film make more money overseas. Perhaps, from a business perspective, necessary . . . but I'm still disappointed.
I don't have a problem with Danny Rand in "Iron Fist" being white, as the comic book character is white. Iron Fist is representative of a whole genre of American film and TV, the white-guy ninja. And while that definitely plays into the discussion of white-washing, it's an example I have zero problems with. Had they cast him with an Asian actor, I would have been fine, but I think the TV series would have lost something integral to what Iron Fist is.
"White-washing" when casting TV and movies is a real problem in Hollywood, however, each project has to be judged by its own merits, it's never black-and-white (pun intended). A lot of folks do get all roused up without understanding why specific casting decisions were made. The "outrage machine" is also a real problem in American society today, IMO.
And, to get back on topic . . . . Ditto with diversity in D&D. Increased diversity is both a wise business decision and the "right thing to do".